Parts of this page show the use of the XPInstall API. The majority of this API is now deprecated and as of Gecko 1.9 no longer available. Extension, theme, and plug-in developers must switch away from install.js based packages to the new packaging scheme with an install.rdf manifest. In particular plugin developers should see how to package a plugin as an extension.
这一部分说明了XPInstall API的使用. 这些API现在已经过时并且到Gecko 1.9时将不再可用. Extension, theme和plug-in的开发者必须要将基于install.js脚本文件的安装包转换成使用新的基于install.rdf清单文件的安装包. 详细的情况plugin开发者可以参考how to package a plugin as an extension.